In a large bowl, beat the eggs and sugar for 3-4 minutes till pale and thick. Lightly fold the yogurt and vanilla extract into this until mixed. Sieve the flour into this gently, folding it into the mix in batches. Once the crust is baked, pour the mix into it, it will reach almost to the top of the pan. Once you arrange the fruits in the center and nuts around the circumference, the tart is ready to go into the oven for 40 minutes at 170 C (325F), until lightly golden around the edges.